In order for natural selection to occur, there must be variation withing the population. which statements are an accurate reflection of the relationship between natural selection and variation in the population? select ALL that apply A) Mutations are caused by natural selection
B) Mutations are a source of variation withing any population
C) Genetic variation is increased in population with sexual reproduction
D) Genetic diversity is decreased overall by the mechanism of natural selection
E) Natural selection lowers the population size but maintains the genetic variation in a population